121145779 has 2 divisors, whose sum is σ = 121145780. Its totient is φ = 121145778.

The previous prime is 121145747. The next prime is 121145797. The reversal of 121145779 is 977541121.

Together with next prime (121145797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (977541121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121145779 - 2⁵ = 121145747 is a prime.

It is a super-3 number, since 3×121145779³ (a number of 25 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121145719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60572889 + 60572890.

It is an arithmetic number, because the mean of its divisors is an integer number (60572890).

Almost surely, 2^121145779 is an apocalyptic number.

121145779 is a deficient number, since it is larger than the sum of its proper divisors (1).

121145779 is an equidigital number, since it uses as much as digits as its factorization.

121145779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17640, while the sum is 37.

The square root of 121145779 is about 11006.6243235608. The cubic root of 121145779 is about 494.8072970275.

The spelling of 121145779 in words is "one hundred twenty-one million, one hundred forty-five thousand, seven hundred seventy-nine".